<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card class="box-card">
            <!-- 警告区域 -->
            <el-alert :closable="false" title="注意：只允许为第三级分类设置相关参数!" type="warning" show-icon></el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedKeys" :options="cateList"
                    :props="cateProps" @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
              <el-tabs v-model="activeName" @tab-click="handleClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                  <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                  <!-- 动态参数表格 -->
                  <el-table :data="manyTableData" stripe border  class="table">
                    <!-- 索引页 -->
                    <el-table-column type="index"></el-table-column>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                      <template slot-scope="scope">
                        <!-- 循环渲染Tag标签 -->
                        <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handelCole(index,scope.row)">{{item}}</el-tag>
                        <!-- 输入的文本框 -->
                        <el-input
                          class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)"
                        >
                      </el-input>
                      <!-- 添加按钮 -->
                      <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                      </template>
                    </el-table-column>
                    <el-table-column prop="attr_name" label="参数名称"></el-table-column>
                    <el-table-column label="操作">
                      <template slot-scope="scope">
                        <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                      </template>
                    </el-table-column>
                  </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                  <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                  <!-- 静态属性表格 -->
                  <el-table :data="onlyTableData" stripe border  class="table">
                    <!-- 索引页 -->
                    <el-table-column type="index"></el-table-column>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                          <!-- 循环渲染Tag标签 -->
                          <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handelCole(index,scope.row)">{{item}}</el-tag>
                          <!-- 输入的文本框 -->
                          <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                          >
                        </el-input>
                        <!-- 添加按钮 -->
                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                      </template>
                    </el-table-column>
                    <el-table-column prop="attr_name" label="属性名称"></el-table-column>
                    <el-table-column label="操作">
                      <template slot-scope="scope">
                        <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                      </template>
                    </el-table-column>
                  </el-table>
                </el-tab-pane>
              </el-tabs>
        </el-card>
        <!-- 添加参数和添加属性的对话框 -->
        <el-dialog :title="'添加' + textText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClose">
          <el-form :model="addruleForm" :rules="addRules" ref="addruleFormRef" label-width="100px">
              <el-form-item :label="textText" prop="attr_name">
                <el-input v-model="addruleForm.attr_name"></el-input>
              </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
          </span>
      </el-dialog>
      <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + textText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClose">
          <el-form :model="editruleForm" :rules="editRules" ref="editruleFormRef" label-width="100px">
              <el-form-item :label="textText" prop="attr_name">
                <el-input v-model="editruleForm.attr_name"></el-input>
              </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
          </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
  created () {
    this.getCateList()
  },
  data () {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 添加参数对话框的开关
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addruleForm: {},
      // 添加参数/添加属性的验证规则对象
      addRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editruleForm: {},
      // 修改表单的验证规则对象
      editRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 获取所有商品分类数据列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.cateList = res.data
    },
    // 级联选择框选中变化,会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleClick () {
      this.getParamsData()
    },
    // 获取参数列表数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('参数列表获取失败')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示于隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClose () {
      this.$refs.addruleFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams () {
      this.$refs.addruleFormRef.validate(async valid => {
        if (valid) {
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addruleForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) return this.$message.error('添加参数失败')
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        }
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog (attrid) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败')
      this.editruleForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClose () {
      this.$refs.editruleFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams () {
      this.$refs.editruleFormRef.validate(async valid => {
        if (valid) {
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editruleForm.attr_id}`, {
            attr_name: this.editruleForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 200) return this.$message.error('修改参数信息失败')
          this.getParamsData()
          this.$message.success('修改成功')
          this.editDialogVisible = false
        }
      })
    },
    // 根据id删除对应的参数项
    removeParams (attrid) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async () => {
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
        if (res.meta.status !== 200) {
          this.$message.error('删除失败')
        } else {
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
          this.getParamsData()
        }
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    },
    // 文本框失去焦点或摁下了Enter都会触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 当页面上元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将对attr_vals 的操作，保存到数据库
    async saveAttrVals (row) {
      // 发起请求进行保存
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('操作失败')
      this.$message.success('操作成功')
    },
    // 删除对应的参数和可选项
    handelCole (index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类Id
    cateId () {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    textText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style scoped>
.box-card,.table{
  margin: 15px 0;
}
.cat_opt{
  margin: 15px 2px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>
